Added HTmL imports snippet, part of the web components specification. Used similar style as link.stylesheet
Added HTmL imports snippet, part of the web components specification.
Used similar style as link.stylesheet

cook/yasnippet-snippets,cook/yasnippet-snippets,bixuanzju/yasnippet-snippets,bixuanzju/yasnippet-snippets,cook/yasnippet-snippets,ageekymonk/yasnippet-snippets,ageekymonk/yasnippet-snippets,ageekymonk/yasnippet-snippets,bixuanzju/yasnippet-snippets